* United States make perfect start * Mickelson, Fowler pull off late comeback * European veteran Westwood struggles (Updates after opening foursomes session) By Mark Lamport-Stokes CHASKA, Minnesota, Sept 30 (Reuters) - A fired-up Jordan Spieth and Patrick Reed set the tone as the United States seized early control at the Ryder Cup on Friday with a 4-0 sweep of the opening foursomes matches against holders Europe. Thunderous roars of "USA, USA, USA" echoed across the ultra-long Hazeltine National layout as twice major winner Spieth and fellow young gun Reed beat European heavyweights Justin Rose and Henrik Stenson 3&2 in the top match to secure the first point. More...